Lamp-socket.



N. MARSHALL.

LAMP SOCKET.

APPLICATION FILED JUNE 7, 1909.

987,152, Patented Mar.21,1911.'

IN VEN TOR.

A TTORNE Y.

7,5 W M V Unrrnn s ln'igns a rnntr OFFICE.

NORMAN MARSHALL, 0F NEWTON, MASSACHUSETTS, ASSIGNOR, BY MESNE ASSIGN-MENTS, TO ARROW ELECTRIC COMPANY, OF HARTFORD, CONNECTICUT, A CORPO-RATION OF CONNECTICUT.

LAMP-SOCKET.

Specification of Letters Patent. Patented lvlar, 21, 191 1,

Application fi led June 7, 1909. Serial No. 500,502.

Sockets; and I do hereby declare the follow- 7 ing to be a full, clear,and exact (lGSCIlPlJlOIL of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same.

The invention relates to incandescent lamp sockets, and moreparticularly to that class of sockets known as pull sockets.

The object of the invention is to provide.

an improved and novel construction of socket in which the switchmechanism is operated to complete and break the circuit by alternatingpulls upon an operating cord depending from the socket.

To these ends the invention consists in the features of construction andcombinations of parts hereinafter described and set forth in the claims.c p v p The various features of the invention Wlll be readily understoodfrom an inspection of the accompanying drawings; in which- 7 Figure 1 isa vertical sectional view through the porcelain base of a pull socketembodying certain features of the invention; Fig. 2 is an end View ofone of the sectional base blocks with certainparts of the switchmechanismremoved; Fig. 3 is a similar view showing certain parts of theswitch to form a chamber within which the switch mechanism is housed andeffectively insulated. Thelamp terminals are secured upon the outer endof the block 15, and comprise a screw shell 19 and acenter contact piece20. The flange of the screw shell is sepa rated from the block 15 by aninterposed washer 21 of fiber or other suitable insulating materialwhich efiectively insulates the shell from the metallic parts carried bythe block 15. The outer end of the block 15 is provided with acylindrical boss 22 which fits within the cylindrical opening in theflange of the screw shell and serves to center the shell on the block.The shell is securedin position upon the block by means of a screw 23which asses through a hole in the flange of the s ell and is th readedinto a plate 24 which engages the inner surface of the flange. The plate24 extends outward through a slot in the shell, and is bent at rightangles'so that its outer end lies within a peripheral recess 25 formedin the block '15'." The outer end of the plate 2 1 is provided with abinding screw 26 to which one'off the conductor wires may be connected,the wire extending through peripheral recesses 27 formed in the blocks15 and 16.

The centercontact piece 20 is secured in position on the end of theboss22 by means of a screw bolt 28 which passes through the base blocks 15and'16, and is provided at its outer end with a nut 29. This bolt actsto bind the base blocks together. and also acts as the pivotal supportfor the switch mechanism as Well as acting to hold the center contactinposition. A disk 30 of insulating material is interposed between thebase of the center contact piece 20 and the end of the boss 22, and theboss is of such thickness thatthis disk assists in retaining the screwshell in position on the end of the block 15. The disk 30 alsoeffectively in" sulates the center contact from the screw shell. Thecenter contact piece .is held from turning under the head of the bolt 28by an inwardly projecting finger 31 formed at its end and arranged topass through a hole in portion 37. The plate is secure ing through which.theuterminal end of .the

center contact Fig. 1. I

The recess 17 in theblock 1s provlded at its inner end with anannulargroove 33 the bottom of which is provided with two piece passes,as indicated-in inclines terminating in abrupt axially ex-itending'shoulders 34 and 35. A segmental contact plate,36. isarrangedupon. onecof,

the inclines at the bottom of the groove 30, and is provided with .aradially extending in position by means of ascrew 38 which passesthroughthe block 15, as indicated in Fig. -6, and: is threaded into a wireterminal plate 39 WlllCll overlies the part 37 of the contact plate andclamps the platein position; The outer end is provided, with a bindingwhich the other conductor wire may be con-:

the circuit comprises aswitch of, the plate 39 extends at'an angle tothe part with which the screw 38' engages, and is arranged in aperipheral recess 40 formed in theblock 15. The outer end of the platescrew 41 by nectedwith the socket; v a

The mechanism .for makingand breaking plate 42 mounted to turn upon thebolt 28 and provided with a segmental spring finger 43 ar-' rangedtotravel around within the. annular groove 33. The plate42 is slitcircumferentially, and the slitted portions bent downward in Fi tions 44in The switch plate may be given a half revo- 1' 1 to form two teethorprojecicated in dotted lines in Fig. 3.

lution to ma e or break the circuit by means of an oscillatory actuatordisk 45 which. is mounted to turn upon the bolt 28,- and may 'be movedin one direction by a pull chain or cord 46,- and moved in the otherdirection, by

a spring 47. The actuator disk is formed from vulcanized fiber or othersuitable insulating material, andis provided with aradially extendingstop finger 48 which is normally,

held against a shoulder 49 in the wall of the recess 17 by the spring47. The actuator disk 45 is provided with aclutch plate 50 secured uponits upper side in Fig. 1, and

provided" with shoul ers 51 arranged to engage the teeth or projections44 on the and bent over against thecor .or chain-carrying groove. Thisannular groove flange isqsecured to the actuator d1skby means ofprojecting fingers which pass through slots formedin the periphery.ofthedisk-andhavetheir ends bent over against the opposite side of thedisk, the flange being so" connected with the disk that it isefi'ectivel plate by the isk. The annular flange is provided with afinger 53 (Fi 4) arranged to lie between two adjacent bafis of the chain46 and connect the end of the chain to the actuator, disk. This enablesthe end of the chain to be readily connected or disconnected from theactuator-disk after the arts have been assembled, the abutting en s ofthe blocks 15 and 16 being recessed at 54' to providean o ening throughwhich access may be had to tlie groove flange at the point where theretaining finger 53 is located. The actuator chain wraps around thegroove flange of the actuator disk and passes out through a guide assage55 formed by r0 erly recessing t e abutting ends of the bloc s15 and 16,and through a guide tube 56 formin a continuation of the passage andexten ing through. the inclosing shell of the socket.

I In the construction shown the guide tube 56 isso connected with thebase of the socket that it may be readily disconnected for the purposeof refinishing, or whenever it is desired to remove the tube foranypurpose. As shown, the innerv end of the tube is threaded in a nut 57which is securely held in an annular grooveformed in the walls of therecess 55. This construction enables the nut to be readily positioned inassembling the parts, and to be securely held in position againstrotation after the parts are assem-- bled, and this construction formsone feature of the invention. In the form of socket shown, the recesses17 and 18 are formed eccentrically in the ends of the blocks 15, andthis construction is preferred for the reason that it provides a thickerwall for the insulating chamber at the side where the nut 57 is located.

Assuming that the parts are in the position indicated in the drawings,the finger 43 of the switch plate 'will lie in engagement with thecontact piece 36,'and electrical connection will be made from the wireterminal 41 through the switch mechanism to the center contact 20. Bypulling on the cord insulated from the clutch 46 the actuator plate may,be rotated until v the stop finger 48 brin s up a ainst a stop 58 formedin the wall o f the re c ess 17. The

cause stop shoulders 49 and 58 are soarrangcd incline at the inner endof the annular groove 38. il hislquickly breaks the circuit,

so that there is no electrical connection =between the wire terminal 41and the centercontact 20. When the cord 46 is released, the spring 47immediately returns the actuator dlsk to the normal position indicatedin Fig. 3. During this movement the clutch plate rides over theprojections 44, the spring yielding to allow the relative axial movementbetween the clutch plate and contact plate. When the actuator cord orchain is again pulled, the switch plate is given another half revolutionto bring the parts into the position indicated in the drawings, and thusa ain complete the circuit.

Whi c it is preferred to employ the specific construction andarrangement. of parts shown and described, it will be understood thatthis construction and arrangement is not essential to the inventionexcept so far as it is specified in the claims, and may be modified andvaried without departing from the broader features of the invention.

Having explained the nature and object of the invention, andspecifically described one of the forms in which it-may beembodied, whatI claim is I 1. An incandescent lamp socket comprising a porcelain base,a pull switch mechanism mounted inthe base, a nut secured in the base,anda guide tube for a ull cord screwed into the nut, substantial y asdescribed. v

2. An. incandescent lamp socket comprising two cylindrical base blocks,a pull switch mechanism mounted between the blocks, recesses in theopposing faces of the Blocks for receiving a nut, a nut held in saidrecesses between the blocks, and a guide tube for a pull cord screwedinto the nut, substantially as described.

3. An incandescent lamp socket comprising two base blocks havingabutting faces recessed to form an insulatin her, an annular groove atthe end 0 one of the recesses, a segmental contact plate arranged alongthe inner end of the annular groove, a rotary switch plate provided,with a finger adapted to travel along said groove prising. twocylindrical chamin contactv withlits inner end, shoulders .on

said contact plate, a clutchplate provided with cotiperating shoulders,an insulating disk carrying the clutch vplate and provided with "groovedii d Pull (rd 0011- f i l in c i Substantially B esorihed.

nected :to

- 4. An, incandescent ,rlamp J com :pmsmg two cylindrical ibase iblocks:having.

abutting faces recessed to form an insulating chamber, lamp' -terminalsupon lone lofjithe blocks, a pgll switch mechanism arranged in i i h iia iprovi' -w it a sto nger 48 a spring or actuating the disk in onedirection, a pull cord for actuating the'disk in the opposite direction,and shoulders 49 and 58 formed in the recess of one of the blocks fordeterming the movements of the actuator disk, substantially asdescribed.

5. An incandescent lamp socket comprising two cylindrical base blockshaving a-buttin faces recessed to form an insulating pa leading from thechamber, a ull switc mechanism mounted in the cham r, a nut held betweenthe blocks with its bore in register with said passage, and a guide tubefor a pull cord screwed into the nut, substantially as described.

6:An incandescent lamp socket comprising two cylindrical base blockshaving abutting faces eccentrically recessed to form an insulatingchamber-and also recessed to forma passage through the thicker wall ofthe chamber and a transverse oove in the wall of the-passage, a nut heldn the groove, a tube fora pull cord screwedinto the nut, and a switchmechanism within the chamber adapted to be operated by a cord extendingthrough the aide tube and passage, sub stantially as escribed.

7 An incandescent lamp socket combase blocks having abuttin faces 1- toform an insulatin 0 amber, lamp terminals upon one of the locks a ullswitch mechanism ar ranged within the chamber, and a screw bolt forsecuring the base blocks together and upon which the switch mechanism isoper-' provided with a flange having-a cylindrical opening fitting aboutthe insulating disk interposed between the base and'flange ofthe shell,and a center coiitact mounted upon the end of the boss and provlded withan inwardly projecting finger-enteri recess in the end of the boss,substantia y as described.

comprising an actuator diskamber and also recessed to form a the shellQL-An incandescent-lamp ;socket c'orntently advancing the switch plate,a pull prising two base blocks having abutting cord connected to movethe actuator in one faces recessed to-.-form-an insulating chamdlrection, and a spring for returnm the beryan annular groove at the endof one of actuator to normal position, substantia 1y as 15 5.the-recesses-provided-with"inclined surfaces described.

at its inner end, a segmental contact plate In testimony whereof I afiixmy signalarranged along one. of said surfaces, a roture, inpresenceof-two witnesses. tary switch-plateprovided witha segmentalNORMAN MARSHALL. finger adapted to travel around said groove Witnesses:a H) in contact with the incline, an actuatorar- WARREN G. OGDEN, rangedwithinthe chamber for intermit- N. D. McPrLAIL.

